hi harshita,

delhi university has very high rating as per its academical performance, infrastructure, faculty , placements and college life as well. though st xavier college also is one of top most colleges ,yet it falls in the top list after the delhi university only.

so,the delhi university is preferable.

apart from this analysis it is better for you to decide regarding your interest and strengths and to which course you fit the most.

keep up hope 

all the best:)